Supply air terminal device

ABSTRACT

The invention concerns a supply air terminal device ( 10 ) including a supply chamber ( 11 ) for the supply air and in the supply chamber ( 11 ) nozzles ( 12   a   1   , 12   a   2   . . . ; 12   b   1   , 12   b   2  . . . ), through which the supply airflow (L 1 ) is conducted into a side chamber (B 1 ) of the supply air terminal device, which side chamber is a structure open at the top part and at the bottom part. The supply air terminal device ( 10 ) includes a heat exchanger ( 14 ), which can be used either to cool or to heat the circulated airflow (L 2 ). In the device solution, fresh supply air, which is conducted through the nozzles to the side chamber (B 1 ), induces the circulated airflow (L 2 ) to flow through the heat exchanger ( 14 ). The combined airflow (L 1 +L 2 ) of supply airflow (L 1 ) and circulated airflow (L 2 ) is conducted out of the supply air terminal device ( 10 ). The supply air terminal device includes an induction ratio control device ( 15 ), which is used to control how much circulated airflow (L 2 ) joins the supply airflow (L 1 ).

FIELD OF THE INVENTION

[0001] The invention concerns a supply air terminal device.

BACKGROUND OF THE INVENTION

[0002] Control of the induction ratio has become a requirement in supply air terminal devices, wherein fresh air is supplied by way of the supply air terminal device and wherein room air is circulated using the device. This means that the ratio between the flow of circulated air and the flow of fresh air can be controlled.

OBJECTS AND SUMMARY OF THE INVENTION

[0003] In the present application, primary airflow means that flow of supply air, and preferably the flow of fresh supply air, which is supplied into the room or such by way of nozzles in the supply air manifold. Secondary air flow means the circulated air flow, that is, that air flow, which is circulated through a heat exchanger from the room space and which air flow is induced by the primary air flow.

[0004] For implementation of the above-mentioned control the present application proposes use of a separate induction ratio control device. According to the invention, the induction ratio control device may be located below the heat exchanger in the mixing chamber. Control may hereby take place by controlling the flow of circulated air L₂. The more the air flow L₂ is throttled, the lower the induction ratio will be, that is, the air volume made to flow through the heat exchanger becomes smaller in relation to the primary air flow.

[0005] Besides the above-mentioned way of controlling the induction ratio, such a control device may also be used, which is formed by a set of nozzles formed by nozzles in two separate rows opening from the supply chamber for fresh air, whereby the nozzles in the first row are formed with a bigger cross-sectional flow area than the nozzles in the second row. The induction ratio control device includes an internal aperture plate used for controlling the flow between the nozzle rows of the said nozzles.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In the following, the invention will be described by referring to some advantageous embodiments of the invention shown in the figures of the appended drawings, but the intention is not to limit the invention to these embodiments only.

[0007]FIG. 1A is an axonometric view of a supply air terminal device according to the invention, which is open at the bottom and open at the top.

[0008]FIG. 1B is a cross-sectional view along line I-I of FIG. 1 A.

[0009]FIG. 1C shows the area X₂ of FIG. 1B.

[0010]FIG. 2 shows an embodiment of the control device according to the invention, wherein the control device is formed by a turning damper located in side chamber B₁.

[0011]FIG. 3A shows an embodiment of the induction ratio control device, wherein the device includes two nozzle rows 12 a ₁, 12 a ₂ . . . and 12 b ₁, 12 b ₂ . . . for the primary air flow L₁, whereby the flow ratio between the nozzles of the nozzle rows is controlled with the aid of an aperture tube located in the supply chamber for the primary air flow, which tube includes flow apertures 18 b ₁, 18 b ₂ . . . for the nozzles of one nozzle row 12 a ₁, 12 a ₂ . . . and flow apertures 18 a ₁, 18 a ₂ . . . for the nozzles of the other nozzle row 12 b ₁, 12 b ₂ . . .

[0012]FIG. 3B is an axonometric partial view of the solution shown in FIG. 3A.

[0013]FIG. 4A shows a fifth embodiment of the control device solution according to the invention.

[0014]FIG. 4B shows the area X₃ of FIG. 4A on an enlarged scale.

DETAILED DESCRIPTION OF THE INVENTION

[0015]FIG. 1A is an axonometric view of the supply air terminal device 10. In order to show the internal parts of the structure, end plate 10 d is cut open in part. The structure includes end plates 10 d at both ends. Supply air L₁ is conducted by way of a supply channel into supply air chamber 11, from which the air is conducted further through nozzles 12 a ₁, 12 a ₂ . . . , 12 b ₁, 12 b ₂ . . . into side or mixing chambers B, of the device on both sides of the vertical central axis Y, of the device and therein downwards. The supply air terminal device 11 includes a heat exchanger 14 in side chamber B, in its upper part as seen in the figure. Side chambers B, are open at the top and at the bottom. Thus, the flow of circulated air L₂ is circulated induced by the primary airflow L₁ through heat exchanger 14 into side chamber B₁, wherein the airflows L₁, L₂ are combined, and the combined airflow L₁+L₂ is made to flow to the side from the device guided by guiding parts 10 b ₁, 13 or such. The secondary airflow L₂ is thus brought about by the primary airflow L₁ from the nozzles 12 a ₁, 12 a ₂ . . . and 12 b ₁, 12 b ₂ . . . of supply chamber 11. In side chamber B, the airflows L₁, L₂ are combined, and the combined airflow is made to flow to the side guided by air guiding parts 13 and the side plates 10 b, of the supply air terminal device, preferably at ceiling level. Heat exchanger 14 may be used for either cooling or heating the circulated air L₂. Under these circumstances, the circulated air L₂ circulated from room H can be treated according to the requirement at each time either by heating it or by cooling it using heat exchanger 14. Heat exchanger 14 includes tubes for the heat transfer medium and, for example, a lamella heat exchanger structure in order to achieve an efficient transfer of heat from the circulated air to the lamellas and further to the heat transfer liquid, when the flow of circulated airflow L₂ is to be cooled, or the other way round, when the flow of circulated airflow L₂ is to be heated.

[0016]FIG. 1B is a cross-sectional view along line I-I of FIG. 1A of a first advantageous embodiment of the invention. Supply air terminal device 10 includes a supply air chamber 11 for the fresh supply air, from which the fresh air is conducted as shown by arrows L₁ through nozzles 12 a ₁, 12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . into the respective side or mixing chamber B₁ of the device and further into room space H. Supply air chamber 11 is located centrally in the device. Heat exchanger 14 is located in front of supply air chamber 11 (above it in the figure) and side chambers BI are formed on both sides of the vertical central axis Y, of the device in between side plates 10 b, and the side plates 11 a, of supply air chamber 11. As the figure shows, side chamber B₁ is a structure open both at the top and at the bottom. Circulated air L₂ induced by the fresh airflow L₁ flows into side chamber B, from room H, whereby the combined airflow L₁+L₂ is made to flow further away from the device, preferably to the side horizontally in the direction of the ceiling and further at ceiling level. According to the invention, the body R of the device includes side plates 10 b ₁ and air guiding parts 13 in connection with supply air chamber 11 at its lower edge. Together, the supply air chamber 11 and the side plates 10 b, limit the chamber BI located at the side of the device. The circulated airflow L₂ flows through heat exchanger 14 of the device into side chamber B₁ induced by the supply airflow L₁. Air guiding parts 13 and side plates 10 b, are shaped in such a way that the combined airflow L₁+L₂ will flow in the horizontal direction to the side and preferably in the ceiling level direction and along this. The heat exchanger 14 may be used for cooling or heating the circulated air L₂. In the embodiment shown in the figure, the device includes an induction ratio control device 15, which is used for controlling the flow volume ratio Q₂/Q₁ between the flows L₁ and L₂.

[0017] Below the nozzles 12 a ₁, 12 a ₂ . . . of the first row of nozzles the nozzles 12 b ₁, 12 b ₂ . . . of the second row of nozzles and the control plate 150 of the induction ratio control device 15 include flow apertures J₁, J₂ . . . located above for nozzles 12 a ₁, 12 a ₂ . . . and flow apertures I₁, I₂ . . . located below for nozzles 12 b ₁, 12 b ₂ . . . When plate 150 is moved in a linear direction vertically (arrow S₁), the flow apertures J₁, J₂ . . . , I₁, I₂ . . . of plate 150 will be placed in a certain covering position in relation to nozzles 12 a ₁, 12 a ₂ . . . , 12 b ₁, 12 b ₂ . . . and their supply apertures e₁, e₂ . . . , t₁, t₂ . . . Thus, the flow L₁ can be controlled as desired from nozzles 12 b ₁, 12 b ₂ . . . , 12 a ₁, 12 a ₂ . . . In addition, the supply apertures e₁, e₂ . . . , t₁, t₂ . . . of the nozzles 12 b ₁, 12 b ₂ . . . , 12 a ₁, 12 a ₂ . . . are preferably made to be of different size, whereby the flow can be controlled as desired through the nozzles 12 b ₁, 12 b ₂ . . . , 12 a ₁, 12 a ₂ . . . of the nozzle rows having cross-sectional flow areas of different sizes. By increasing the flow L₁ through nozzles 12 a ₁, 12 a ₂ . . . of one nozzle row by a corresponding volume the flow through the nozzles 12 b ₁ 12 b ₂ . . . of the other nozzle row is reduced, and vice versa. In this manner the rate of flow L₁ can be controlled in side chamber B₁ and that induction effect can also be controlled, which flow L₁ has on flow L₂, that is, the induction ratio between the flows L₁ and L₂ can be determined. The induction ratio means the relation of flow volume Q₂ of flow L₂ to the flow volume Q₁ of flow L₁, that is, Q₂/Q₁. The combined airflow L₁+L₂ flows guided by side guiding parts 13 and 10 b ₁ preferably to the side from the supply air terminal device. With devices according to the invention, the induction ratio is typically in a range of 2-6.

[0018]FIG. 1C shows the area X₂ of FIG. 1 B on an enlarged scale.

[0019]FIG. 2 shows a second advantageous embodiment of the invention, wherein the induction ratio control device 15 is formed by a control plate 150 turning in side chamber B₁. Control plate 150 is articulated to turn around pivot point N₁, and control plate 150 is moved by an eccentric piece mechanism 17, which includes a shaft 17 a, adapted to rotate an eccentric disc 17 a ₂. Eccentric disc 17 a ₂ for its part rotates control plate 150. Thus, in the embodiment shown in FIG. 2, the induction distance of jet L₁ is controlled in side chamber B₁ and thus the induction ratio Q₂/Q₁ between the flows L₂ and L₁ is controlled.

[0020]FIG. 3A shows an embodiment of the invention, wherein the induction ratio control device 15 is formed in supply air chamber by a turning tube 18 located inside it and including flow apertures 18 a ₁, 18 a ₂ . . . , 18 b ₁, 18 b ₂ . . . in two rows roughly on opposite sides of tube 18. Supply air chamber 11, which is a structure having a circular cross section, includes nozzles 12 a ₁, 12 a ₂ . . . , 12 b ₁, 12 b ₂ . . . in two rows, into which flow apertures e₁, e₂ . . . , t₁, t₂, . . . open. By turning tube 18 (as shown by arrow S₁) including internal apertures 18 a ₁, 18 a ₂ . . . , 18 b ₁, 18 b ₂ . . . the apertures 18 a ₁, 18 a ₂ . . . , 18 b ₁, 18 b ₂ . . . in tube 18 are moved to the desired covering position in relation to supply apertures e₁, e₂ . . . , t₁t₂ . . . of the nozzles 12 a ₁, 12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . Nozzles 12 b ₁, 12 b ₂ . . . have larger nozzle apertures t₁, t₂ . . . than the nozzles 12 a ₁, 12 a ₂ . . . located beside them, which have nozzle apertures e₁, e₂, . . . with a smaller cross-sectional flow area than the flow apertures t₁, t₂ . . . of nozzles 12 b ₁, 12 b ₂ . . . The following is arranged on the other side of central axis Y, at the location of the rows of nozzles 12 a ₁, 12 a ₂ . . . , 12 b ₁, 12 b ₂ . . . Nozzles 12 b ₁, 12 b ₂ . . . are located below nozzles 12 a ₁, 12 a ₂ . . . According to the invention, by rotating the internal tube 18 of the tubular supply air chamber 11 the flow can be guided as desired either into nozzles 12 b ₁, 12 b ₂ . . . or into nozzles 12 a ₁, 12 a ₂ . . . In this manner the flow rate of supply airflow L₁ in side chamber B, can be changed, and in this way the induction ratio between the flows L₂ and L₁ can be controlled, that is, the induction effect of flow L₁ on the flow of circulated air L₂ can be controlled. By increasing the flow into the nozzles of one nozzle row, for example, into nozzles 12 a ₁, 12 a ₂ . . . , by a corresponding volume the flow is reduced into the nozzles 12 b ₁, 12 b ₂ . . . of the other row, or the other way round. The total flow volume for flow L₁ through nozzle rows 12 a ₁, 12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . remains constant, but the flow rate changes, whereby the induction ratio is controlled.

[0021]FIG. 3B is an axonometric partial view of the solution shown in FIG. 3A.

[0022]FIG. 4A shows a fourth advantageous embodiment of the invention, wherein the induction ratio between flows L₁ and L₂ is controlled by controlling a plate 10 c, located in exhaust opening 30 and joined to side plate 10 b. As shown by arrow O₁in the figure, the plate 10 c ₁ can be turned around pivot point N₂ to the desired angle, whereby the induction ratio between flows L₁ and L₂ is also controlled.

[0023]FIG. 4B shows the area X₃ of FIG. 4A on an enlarged scale. As shown in the figure, the plate 10 c ₁ can be turned around pivot point N₂ as shown by arrow O₁. 

We claim:
 1. A supply air terminal device (10) comprising a supply chamber (11) for the supply air and from supply chamber (11) nozzles (12 a ₁, 12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . ), through which the supply airflow (L₁) is guided into a side chamber (B₁) of the supply air terminal device which is a structure open at the top part and at the bottom part and including a heat exchanger (14), which can be used for either cooling or heating the circulated air (L₂), and that in the device solution the fresh supply air, which is guided through the nozzles into the side chamber (B₁), induces the circulated airflow (L₂) to flow through the heat exchanger (14), and that the combined airflow (L₁+L₂) of the supply airflow (L₁) and the circulated airflow (L₂) is conducted out of the supply air terminal device (10), wherein the supply air terminal device includes an induction ratio control device (15), which is used for controlling how much circulated airflow (L₂) joins the supply airflow (L₁).
 2. A supply air terminal device according to claim 1, wherein the induction ratio control device (15) is formed by a structure, wherein the first nozzles (12 a ₁, 12 a ₂ . . . ) of the supply air chamber (11) are in a first row and in association with them in parallel there are the nozzles (12 b ₁, 12 b ₂ . . . ) of a second row of nozzles having supply apertures (t₁, t₂ . . . ) with a cross-sectional flow area different from the cross-sectional flow area of the supply apertures of nozzles (12 a ₁, 12 a ₂ . . . ), and that a control plate (150) includes flow apertures (J₁, J₂ . . . ; I₁, I₂ . . . ) in two rows and co-operating with the supply apertures (e₁, e₂ . . . ; t₁, t₂ . . . ) of the nozzles (12 a ₁, 12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . ) of the supply air chamber (11), whereby by moving plate (150) the flow to one set of nozzles (12 a ₁, 12 a ₂ . . . ) is throttled while the throttling to the other set of nozzles (12 b ₁, 12 b ₂ . . . ) is reduced by a corresponding volume, or the other way round, whereby the flow volume of the supply airflow (L₁) from supply air chamber (11) remains constant, but in the above-mentioned control the flow rate of the supply airflow (L₁) changes and in this way that volume of circulated air (L₂) is controlled, which is induced by flow (L₁) to flow through the heat exchanger (14).
 3. A supply air terminal device according to claim 1, wherein the supply air chamber (11) is formed by a structure having a circular cross section, inside which there is a rotating control tube (18) and roughly on its opposite sides there are in two rows flow apertures (18 a ₁, 18 a ₂ . . . ; 18 b ₁, 18 b ₂ . . . ) and that in the supply air chamber (11) there are in two rows nozzles (12 a ₁, 12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . ), whereby by rotating the tube (18) the flow ratio between the rows of nozzles (12 a ₁, 12 a ₂ . . . ; 12 b ₁, 12 b ₂ . . . ) can be controlled and the rate of flow (L₁) in the side chamber (B₁) can also be controlled.
 4. A supply air terminal device according to claim 3, wherein the cross-sectional flow area of the nozzles (12 a ₁, 12 a ₂ . . . ) in the first row is different from the cross-sectional flow area of the nozzles (12 b ₁, 12 b ₂. . . ) in the second row.
 5. A supply air terminal device according to claim 1, wherein the control device (15) is formed by a control plate (150), which is adapted to rotate around a pivot point (N₁) in the side chamber (B₁), whereby by using the said control plate (150) the induction ratio between the flows (L₂ and L₁) is controlled, by controlling the circulated airflow (L₂) from the heat exchanger (14) into the side chamber (B₁) before the circulated airflow (L₂) joins the supply airflow (L₁) in the side chamber (B₁).
 6. A supply air terminal device according to claim 5, wherein the control plate (150) is adapted to turn around a pivot point (N₁) with the aid of an eccentric piece mechanism (17) including a shaft (17 a ₁) adapted to rotate an eccentric disc (17 a ₂) or such joined to the shaft (17 a ₁), which eccentric disc is adapted to move the control plate (150).
 7. A supply air terminal device according to claim 1, wherein the induction ratio control device (15) is formed by a movable plate (10 a ₁) located in connection with the exhaust opening (30) of the supply air terminal device.
 8. A supply air terminal device according to claim 7, wherein the induction ratio control device (15) includes a turning plate (10 c ₁), which is located in the exhaust opening (30) of the supply air terminal device and joined to the side plate (10 b ₁) and which can be turned around a pivot point (N₂) to different control positions. 